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29 Cards in this Set
- Front
- Back
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Triploblastic
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Meaning three layers of tissue
1) Ectoderm 2) Mesodermis 3) Endoderm |
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Acoelomate
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meaning “without coelom”.
NO BODY CAVITY. |
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Bilateral Symmetry
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Division down the center produces a mirror image.
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Cephalization
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Concentration of sensory and food gathering structures into a front or head region. Ceph means “head”.
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Organ system
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Organs with different functions working together for the betterment of the organism.
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Incomplete Digestive system
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Includes a mouth and intestine but no anus. Poop where you eat.
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Trematoda
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Contains parasitic blood flukes and lung flukes. May evolve in three different hosts in one life cycle (zombie slugs that get eaten by birds)
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Hermaphroditic (Monecious)
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Has both male and female sexual organs in the same individual.
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Cestoda
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Includes the tapeworms and is different from flukes. Need 2 hosts to complete life cycle. Cest- large intestine, poop.
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Proglottid
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The sections along the body of the worm. In tapeworms they begin with simple male/female structures and toward the end of the worm are full of fertilized eggs.
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Gravid
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The oldest of the proglottid are full of fertilized eggs.
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Turbellaria
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Relatively colorful, harmless, mostly marine. Acoelomate body, 3 germ layers. "Penis fights"
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Nemertea
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Includes 1000 predatory species of ribbon worms. Known for tube like proboscis which catches prey.
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Complete Digestive System
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Consists of mouth, intestine, and anus.
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Epidermis
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Outer layer of cells.
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Gastrodermis
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Lines the inner cavity of both forms of polyps and medusa.
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Mesoglea
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The only means of internal support for Cnidaria. (even though it isn’t a true hydrostatic skeleton)
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Radial Symmetry
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Body parts are arranged around a central axis.
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Nematocysts
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The harpoon structure that is shot from a cnidocyte cell that helps stun or kill prey. Also used to help identify different species of jellyfish.
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Cnidocyte
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The specialized cell that holds the nematocyst(s).
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Cnidocil
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The hairlike trigger mechanism that (if disturbed by anything passing by) triggers a combustion of nematocysts.
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Polyp
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A cylindrical tube with a stalk that may be attached to the substrate or to a main stalk.
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Medusa
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The form that is bell shaped and usually has a thick jelly-like mesogleal layer, hence the name jellyfish.
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Hydrozoa
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Class of Cnidaria. Solitary or colonial. Dominant part of life cycle is in polyp form.
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Dioeceous
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Meaning two sexes.
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Scyphozoa
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Class that includes the larger jellyfish, which are free-living and solitary. Dominant form is medusa, w/ polyp stage reduced or absent.
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Planula
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A zygote formed in Class Scyphozoa when sperm is carried by water into female gastric pouches.
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Scyphistoma
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The stage after planula is released, it attaches itself to a suitable surface where it develops into the polyp form.
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Strobilia
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consists of a series of ephyrae, which break loose and develop into mature jellyfish.
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